Pen



FIG. 1 is a right side elevational view of a pen showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a right side elevational view of the pen in writing condition, the opposite side being a mirror image thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof;

FIG. 9 is a front elevational view thereof; and

FIG. 10 is a rear elevational view thereof. 

The ornamental design for a pen, as shown and described. 